Server Code Patching

As of version 1.0.0-rc3, the Core API Suite requires SubL code patches which are not present in ResearchCyc 4.0q or EnterpriseCyc 1.7-preview. These patches can be applied manually, or they can be automatically applied by the API bundle itself.

Automatic patching

As of version 1.0.0-rc3, the Core API Suite can detect and apply missing SubL code patches to a Cyc server. This is not intended as a general update mechanism, but to enable API functionality by applying a small set of bundled, focused patches as necessary. This feature is only designed to apply specific patches which have been bundled with the Core API Suite, and is not designed to download arbitrary patches from a network.

For example: When returning KBObjects, com.cyc.kb.client.KBObjectImpl#convertToKBObject(CycObject) does some work to find the most specific subtype of KBObject for a particular term. Early implementations performed this as a client-side decision tree: this resulted in multiple calls to Cyc, which meant that things could get fairly slow when returning many KBObjects; this in turn slowed down the processing of query results. In version 1.0.0-rc3, this was reimplemented to push the tightening code to Cyc, but previously-supported Cyc releases (ResearchCyc 4.0q and EnterpriseCyc 1.7-preview) do not have the required SubL function. Thus, a patch file is bundled with the Core API Suite which can be automatically applied if the required SubL function is missing, and compatibility is maintained.

This behavior is disabled by default, but may be enabled by the cyc.session.server.patchingAllowed property. For example, if running the Core API test suite from the command line against a Cyc server at localhost:3600:

mvn verify -Dcyc.session.server.patchingAllowed=true -Dcyc.session.server=localhost:3600

Manual patching

First, you’ll need a copy of the subl api-patches directory, which can be found in the sources at core-client/base-client/src/main/resources/subl/api-patches. If you don’t have them already, you can download the sources here.


  1. Copy the api-patches directory into your Cyc server’s init directory. In ResearchCyc 4.0q and EnterpriseCyc 1.7-preview, this lives at server/cyc/run/init.
  2. You should now have a server/cyc/run/init/api-patches directory containing multiple *.lisp files, including init-api-patches.lisp
  3. Edit init/jrtl-release-init.lisp. At the end of the file, add the following:
;; Load compatibility patches for Cyc Core APIs
;; For more information, see
(load "init/api-patches/init-api-patches.lisp")

The next time you start up your server, it should be patched.